Perhaps you should try some spelling variations:
"supply china immigration policies." » "supply china immigration policy.", "supply china migration policy.", "supply china migration policies.", "supply chinese immigration policies.", "supply china integration policies.", "supply chains immigration policies.", "supply chain immigration policies."
"supply cote integration theories." » "supply cote integration theorems.", "supply cote integrationstheorie 2.", "supply cote integration theory.", "supply care integration theories.", "supply content integration theories.", "supply scale integration theories.", "supply costs integration theories.", "supply cost integration theories.", "supply case integration theories."

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply china immigration policies.") OR ("supply cote integration theories."))~.
• Removing quotes may allow a broader search: (( supply china immigration policies. ) or ( supply cote integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply china immigration policies.") or ("supply cote integration theories."))*.